Re: [OM] OM in Encarta 99!!!

Subject: Re: [OM] OM in Encarta 99!!!
From: "W. J. Liles" <wliles@xxxxxxxxx>
Date: Fri, 06 Aug 1999 15:24:47 -0500
Alex.Hughes@xxxxxxxxxx wrote:
> It is my understanding that forcing something at high pressure through a
> confined space actually cools it down as it escapes (hence although your 
> breath
> is warm when you blow with your lips together it feels cool, and aerosol 
> sprays
> always feel cool. (it is also the principle that refidgerators work on).

Actually that works for gases, not for liquids.  A gas that is allowed
to suddenly expand will cool.  Water, since it does not expand when the
pressure is released (unless it is hot enough to flash to steam and thus
expand) will not cool down.

W. J. Liles

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